{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "The study objective was to investigate the potential of a beverage containing silymarin and l - arginine to alter basic physiological and urodynamic parameters in 22 normal healthy men aged 38 - 59years ."}
{"Chemical": ["l - arginine"]}